diff --git a/src/components/dialog/GlobalDialog.vue b/src/components/dialog/GlobalDialog.vue
index 67f21481d7..6abf62db22 100644
--- a/src/components/dialog/GlobalDialog.vue
+++ b/src/components/dialog/GlobalDialog.vue
@@ -8,9 +8,10 @@
       @update:open="(open) => onRekaOpenChange(item.key, open)"
     >
       <DialogPortal>
-        <DialogOverlay />
+        <DialogOverlay :class="item.dialogComponentProps.overlayClass" />
         <DialogContent
           :size="item.dialogComponentProps.size ?? 'md'"
+          :maximized="!!item.dialogComponentProps.maximized"
           :class="item.dialogComponentProps.contentClass"
           :aria-labelledby="item.key"
           @escape-key-down="
@@ -25,28 +26,46 @@
           "
           @mousedown="() => dialogStore.riseDialog({ key: item.key })"
         >
-          <DialogHeader v-if="!item.dialogComponentProps.headless">
-            <component
-              :is="item.headerComponent"
-              v-if="item.headerComponent"
-              v-bind="item.headerProps"
-              :id="item.key"
-            />
-            <DialogTitle v-else :id="item.key">
-              {{ item.title || ' ' }}
-            </DialogTitle>
-            <DialogClose v-if="item.dialogComponentProps.closable !== false" />
-          </DialogHeader>
-          <div class="flex-1 overflow-auto px-4 py-2">
+          <template v-if="item.dialogComponentProps.headless">
             <component
               :is="item.component"
               v-bind="item.contentProps"
               :maximized="item.dialogComponentProps.maximized"
             />
-          </div>
-          <DialogFooter v-if="item.footerComponent">
-            <component :is="item.footerComponent" v-bind="item.footerProps" />
-          </DialogFooter>
+          </template>
+          <template v-else>
+            <DialogHeader>
+              <component
+                :is="item.headerComponent"
+                v-if="item.headerComponent"
+                v-bind="item.headerProps"
+                :id="item.key"
+              />
+              <DialogTitle v-else :id="item.key">
+                {{ item.title || ' ' }}
+              </DialogTitle>
+              <div class="flex items-center gap-1">
+                <DialogMaximize
+                  v-if="item.dialogComponentProps.maximizable"
+                  :maximized="!!item.dialogComponentProps.maximized"
+                  @toggle="toggleMaximize(item)"
+                />
+                <DialogClose
+                  v-if="item.dialogComponentProps.closable !== false"
+                />
+              </div>
+            </DialogHeader>
+            <div class="flex-1 overflow-auto px-4 py-2">
+              <component
+                :is="item.component"
+                v-bind="item.contentProps"
+                :maximized="item.dialogComponentProps.maximized"
+              />
+            </div>
+            <DialogFooter v-if="item.footerComponent">
+              <component :is="item.footerComponent" v-bind="item.footerProps" />
+            </DialogFooter>
+          </template>
         </DialogContent>
       </DialogPortal>
     </Dialog>
@@ -55,7 +74,6 @@
       v-model:visible="item.visible"
       class="global-dialog"
       v-bind="item.dialogComponentProps"
-      :pt="getDialogPt(item)"
       :aria-labelledby="item.key"
     >
       <template #header>
@@ -86,29 +104,20 @@
 </template>
 
 <script setup lang="ts">
-import { merge } from 'es-toolkit/compat'
 import PrimeDialog from 'primevue/dialog'
-import type { DialogPassThroughOptions } from 'primevue/dialog'
-import { computed } from 'vue'
 
 import Dialog from '@/components/ui/dialog/Dialog.vue'
 import DialogClose from '@/components/ui/dialog/DialogClose.vue'
 import DialogContent from '@/components/ui/dialog/DialogContent.vue'
 import DialogFooter from '@/components/ui/dialog/DialogFooter.vue'
 import DialogHeader from '@/components/ui/dialog/DialogHeader.vue'
+import DialogMaximize from '@/components/ui/dialog/DialogMaximize.vue'
 import DialogOverlay from '@/components/ui/dialog/DialogOverlay.vue'
 import DialogPortal from '@/components/ui/dialog/DialogPortal.vue'
 import DialogTitle from '@/components/ui/dialog/DialogTitle.vue'
-import { useFeatureFlags } from '@/composables/useFeatureFlags'
-import { isCloud } from '@/platform/distribution/types'
-import type { DialogComponentProps, DialogInstance } from '@/stores/dialogStore'
+import type { DialogInstance } from '@/stores/dialogStore'
 import { useDialogStore } from '@/stores/dialogStore'
 
-const { flags } = useFeatureFlags()
-const teamWorkspacesEnabled = computed(
-  () => isCloud && flags.teamWorkspacesEnabled
-)
-
 const dialogStore = useDialogStore()
 
 function isRekaItem(item: DialogInstance) {
@@ -119,20 +128,8 @@ function onRekaOpenChange(key: string, open: boolean) {
   if (!open) dialogStore.closeDialog({ key })
 }
 
-function getDialogPt(item: {
-  key: string
-  dialogComponentProps: DialogComponentProps
-}): DialogPassThroughOptions {
-  const isWorkspaceSettingsDialog =
-    item.key === 'global-settings' && teamWorkspacesEnabled.value
-  const basePt = item.dialogComponentProps.pt || {}
-
-  if (isWorkspaceSettingsDialog) {
-    return merge(basePt, {
-      mask: { class: 'p-8' }
-    })
-  }
-  return basePt
+function toggleMaximize(item: DialogInstance) {
+  item.dialogComponentProps.maximized = !item.dialogComponentProps.maximized
 }
 </script>
 
@@ -163,19 +160,6 @@ function getDialogPt(item: {
   }
 }
 
-/* Workspace mode: wider settings dialog */
-.settings-dialog-workspace {
-  width: 100%;
-  max-width: 1440px;
-  height: 100%;
-}
-
-.settings-dialog-workspace .p-dialog-content {
-  width: 100%;
-  height: 100%;
-  overflow-y: auto;
-}
-
 .manager-dialog {
   height: 80vh;
   max-width: 1724px;
diff --git a/src/components/ui/dialog/DialogContent.vue b/src/components/ui/dialog/DialogContent.vue
index 4d89e5c0a2..c318107642 100644
--- a/src/components/ui/dialog/DialogContent.vue
+++ b/src/components/ui/dialog/DialogContent.vue
@@ -10,11 +10,13 @@ import { dialogContentVariants } from './dialog.variants'
 
 const {
   size,
+  maximized = false,
   class: customClass = '',
   ...restProps
 } = defineProps<
   DialogContentProps & {
     size?: DialogContentSize
+    maximized?: boolean
     class?: HTMLAttributes['class']
   }
 >()
@@ -26,7 +28,7 @@ const forwarded = useForwardPropsEmits(restProps, emits)
 <template>
   <DialogContent
     v-bind="forwarded"
-    :class="cn(dialogContentVariants({ size }), customClass)"
+    :class="cn(dialogContentVariants({ size, maximized }), customClass)"
   >
     <slot />
   </DialogContent>
diff --git a/src/components/ui/dialog/DialogMaximize.vue b/src/components/ui/dialog/DialogMaximize.vue
new file mode 100644
index 0000000000..dd66494de6
--- /dev/null
+++ b/src/components/ui/dialog/DialogMaximize.vue
@@ -0,0 +1,25 @@
+<script setup lang="ts">
+import { useI18n } from 'vue-i18n'
+
+import Button from '@/components/ui/button/Button.vue'
+
+const { maximized = false } = defineProps<{ maximized?: boolean }>()
+const emit = defineEmits<{ toggle: [] }>()
+
+const { t } = useI18n()
+</script>
+
+<template>
+  <Button
+    :aria-label="maximized ? t('g.restoreDialog') : t('g.maximizeDialog')"
+    size="icon"
+    variant="muted-textonly"
+    @click="emit('toggle')"
+  >
+    <i
+      :class="
+        maximized ? 'icon-[lucide--minimize-2]' : 'icon-[lucide--maximize-2]'
+      "
+    />
+  </Button>
+</template>
diff --git a/src/components/ui/dialog/dialog.variants.ts b/src/components/ui/dialog/dialog.variants.ts
index f3b7d1b61e..2ee8b7de2a 100644
--- a/src/components/ui/dialog/dialog.variants.ts
+++ b/src/components/ui/dialog/dialog.variants.ts
@@ -2,7 +2,7 @@ import type { VariantProps } from 'cva'
 import { cva } from 'cva'
 
 export const dialogContentVariants = cva({
-  base: 'fixed top-1/2 left-1/2 z-1700 flex max-h-[85vh] w-[calc(100vw-1rem)] -translate-x-1/2 -translate-y-1/2 flex-col rounded-lg border border-border-subtle bg-base-background shadow-lg outline-none data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[state=open]:animate-in data-[state=open]:fade-in-0 data-[state=open]:zoom-in-95',
+  base: 'fixed z-1700 flex flex-col rounded-lg border border-border-subtle bg-base-background shadow-lg outline-none data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[state=open]:animate-in data-[state=open]:fade-in-0 data-[state=open]:zoom-in-95',
   variants: {
     size: {
       sm: 'sm:max-w-sm',
@@ -10,10 +10,15 @@ export const dialogContentVariants = cva({
       lg: 'sm:max-w-3xl',
       xl: 'sm:max-w-5xl',
       full: 'sm:max-w-[calc(100vw-1rem)]'
+    },
+    maximized: {
+      true: 'inset-2 top-2 left-2 size-auto max-h-none max-w-none sm:max-w-none',
+      false: 'top-1/2 left-1/2 max-h-[85vh] w-[calc(100vw-1rem)] -translate-1/2'
     }
   },
   defaultVariants: {
-    size: 'md'
+    size: 'md',
+    maximized: false
   }
 })
 
diff --git a/src/locales/en/main.json b/src/locales/en/main.json
index 85d6009b5f..709fb9fe74 100644
--- a/src/locales/en/main.json
+++ b/src/locales/en/main.json
@@ -138,6 +138,8 @@
     "hideLeftPanel": "Hide left panel",
     "showRightPanel": "Show right panel",
     "hideRightPanel": "Hide right panel",
+    "maximizeDialog": "Maximize dialog",
+    "restoreDialog": "Restore dialog",
     "or": "or",
     "defaultBanner": "default banner",
     "enableOrDisablePack": "Enable or disable pack",
diff --git a/src/platform/settings/composables/useSettingsDialog.test.ts b/src/platform/settings/composables/useSettingsDialog.test.ts
new file mode 100644
index 0000000000..836d457538
--- /dev/null
+++ b/src/platform/settings/composables/useSettingsDialog.test.ts
@@ -0,0 +1,92 @@
+/**
+ * Settings dialog migration regression net: `useSettingsDialog().show()` must
+ * open the Reka-renderer path with sizing that matches the previous
+ * `BaseModalLayout size="sm"` (960px × 80vh). Catches accidental reverts of
+ * the Phase 3 renderer flip.
+ */
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+const showDialog = vi.hoisted(() => vi.fn())
+const teamWorkspacesFlag = vi.hoisted(() => ({ value: false }))
+const isCloudRef = vi.hoisted(() => ({ value: false }))
+
+vi.mock('@/stores/dialogStore', () => ({
+  useDialogStore: () => ({ showDialog, closeDialog: vi.fn() })
+}))
+
+vi.mock('@/composables/useFeatureFlags', () => ({
+  useFeatureFlags: () => ({
+    flags: {
+      get teamWorkspacesEnabled() {
+        return teamWorkspacesFlag.value
+      }
+    }
+  })
+}))
+
+vi.mock('@/platform/distribution/types', () => ({
+  get isCloud() {
+    return isCloudRef.value
+  }
+}))
+
+vi.mock('@/i18n', () => ({ t: (k: string) => k }))
+
+vi.mock('@/platform/telemetry', () => ({
+  useTelemetry: () => ({ trackEvent: vi.fn() })
+}))
+
+vi.mock('@/composables/billing/useBillingContext', () => ({
+  useBillingContext: () => ({
+    isActiveSubscription: { value: true },
+    isFreeTier: { value: false },
+    type: { value: 'legacy' }
+  })
+}))
+
+import { useSettingsDialog } from '@/platform/settings/composables/useSettingsDialog'
+
+describe('useSettingsDialog', () => {
+  beforeEach(() => {
+    showDialog.mockReset()
+    teamWorkspacesFlag.value = false
+    isCloudRef.value = false
+  })
+
+  it("show() opens the Reka renderer with size 'full' and 960px content sizing", () => {
+    useSettingsDialog().show()
+    const [args] = showDialog.mock.calls[0]
+    expect(args.key).toBe('global-settings')
+    expect(args.dialogComponentProps.renderer).toBe('reka')
+    expect(args.dialogComponentProps.size).toBe('full')
+    expect(args.dialogComponentProps.contentClass).toContain('max-w-[960px]')
+    expect(args.dialogComponentProps.contentClass).toContain('h-[80vh]')
+  })
+
+  it('show() omits overlayClass when not in workspace mode', () => {
+    useSettingsDialog().show()
+    const [args] = showDialog.mock.calls[0]
+    expect(args.dialogComponentProps.overlayClass).toBeUndefined()
+  })
+
+  it("show() sets overlayClass 'p-8' when isCloud && teamWorkspacesEnabled", () => {
+    isCloudRef.value = true
+    teamWorkspacesFlag.value = true
+
+    useSettingsDialog().show()
+    const [args] = showDialog.mock.calls[0]
+    expect(args.dialogComponentProps.overlayClass).toBe('p-8')
+  })
+
+  it('show(panel) forwards defaultPanel to the dialog props', () => {
+    useSettingsDialog().show('about')
+    const [args] = showDialog.mock.calls[0]
+    expect(args.props.defaultPanel).toBe('about')
+  })
+
+  it('showAbout() opens the about panel', () => {
+    useSettingsDialog().showAbout()
+    const [args] = showDialog.mock.calls[0]
+    expect(args.props.defaultPanel).toBe('about')
+  })
+})
diff --git a/src/platform/settings/composables/useSettingsDialog.ts b/src/platform/settings/composables/useSettingsDialog.ts
index bb8162ad38..730637c6c4 100644
--- a/src/platform/settings/composables/useSettingsDialog.ts
+++ b/src/platform/settings/composables/useSettingsDialog.ts
@@ -1,3 +1,5 @@
+import { useFeatureFlags } from '@/composables/useFeatureFlags'
+import { isCloud } from '@/platform/distribution/types'
 import { useDialogService } from '@/services/dialogService'
 import { useDialogStore } from '@/stores/dialogStore'
 
@@ -6,15 +8,20 @@ import type { SettingPanelType } from '@/platform/settings/types'
 
 const DIALOG_KEY = 'global-settings'
 
+const SETTINGS_CONTENT_CLASS =
+  'w-[90vw] max-w-[960px] sm:max-w-[960px] h-[80vh] max-h-none rounded-2xl overflow-hidden'
+
 export function useSettingsDialog() {
   const dialogService = useDialogService()
   const dialogStore = useDialogStore()
+  const { flags } = useFeatureFlags()
 
   function hide() {
     dialogStore.closeDialog({ key: DIALOG_KEY })
   }
 
   function show(panel?: SettingPanelType, settingId?: string) {
+    const isWorkspaceMode = isCloud && flags.teamWorkspacesEnabled
     dialogService.showLayoutDialog({
       key: DIALOG_KEY,
       component: SettingDialog,
@@ -22,6 +29,12 @@ export function useSettingsDialog() {
         onClose: hide,
         ...(panel ? { defaultPanel: panel } : {}),
         ...(settingId ? { scrollToSettingId: settingId } : {})
+      },
+      dialogComponentProps: {
+        renderer: 'reka',
+        size: 'full',
+        contentClass: SETTINGS_CONTENT_CLASS,
+        overlayClass: isWorkspaceMode ? 'p-8' : undefined
       }
     })
   }
diff --git a/src/stores/dialogStore.ts b/src/stores/dialogStore.ts
index 4bb3161391..e0447884dc 100644
--- a/src/stores/dialogStore.ts
+++ b/src/stores/dialogStore.ts
@@ -48,6 +48,11 @@ interface CustomDialogComponentProps {
    * PrimeVue path — use `pt` for that renderer.
    */
   contentClass?: HTMLAttributes['class']
+  /**
+   * Class applied to the Reka-UI `DialogOverlay` element. Ignored on the
+   * PrimeVue path — use `pt.mask` for that renderer.
+   */
+  overlayClass?: HTMLAttributes['class']
 }
 
 export type DialogComponentProps = ComponentAttrs<typeof GlobalDialog> &